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export type ServerSentEvent = { id?: string; type?: string; data: string };
/** Given a string of SSE data, parse it into a `ServerSentEvent` object. */
export function parseEvent(event: string) {
const buffer: ServerSentEvent = { data: "" };
return event.split(/\r?\n/).reduce(parseLine, buffer);
}
function parseLine(event: ServerSentEvent, line: string) {
const separator = line.indexOf(":");
const field = separator === -1 ? line : line.slice(0, separator);
const value = separator === -1 ? "" : line.slice(separator + 1);
switch (field) {
case "id":
event.id = value.trim();
break;
case "event":
event.type = value.trim();
break;
case "data":
event.data += value.trimStart();
break;
default:
break;
}
return event;
}
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